EDI convection measurements at 5-6 RE in the post-midnight region
Other literature type
Quinn, J. M.
Jordanova, V. K.
Bauer, O. H.
Kerr, S. S.
Kletzing, C. A.
McIlwain, C. E.
Torbert, R. B.
Whipple, E. C.
(issn: 1432-0576, eissn: 1432-0576)
arxiv: Physics::Space Physics
We present the first triangulation
measurements of electric fields with the electron drift instrument (EDI) on
Equator-S. We show results from five high-data-rate passes of the satellite
through the near-midnight equatorial region, at geocentric distances of
approximately 5–6 R<sub>E</sub>, during geomagnetically quiet conditions. In a
co-rotating frame of reference, the measured electric fields have magnitudes of
a few tenths of mV/m, with the <b>E</b> × <b>B</b> drift generally directed
sunward but with large variations. Temporal variations of the electric field on
time scales of several seconds to minutes are large compared to the average
magnitude. Comparisons of the "DC" baseline of the EDI-measured
electric fields with the mapped Weimer ionospheric model and the Rowland and
Wygant CRRES measurements yield reasonable agreement.<br><br><b>Key words.</b> Magnetospheric physics (electric fields;
plasma convection; instruments and techniques)